A plastic film blowing machine with replaceable screen and use method thereof

Abstract

The present invention discloses a plastic film blowing machine with a replaceable screen and a method of using the same, and relates to the technical field of winding devices, including: a feeding structure, which is used to convey raw materials to the rear; a filtering structure, which is used to filter particles in the plastic material in a molten state conveyed in the feeding structure, the filtering structure being connected to the feeding structure, the filtering structure comprising a mounting cylinder, a connecting cylinder, a filter plate and a filter screen, the connecting cylinder being mounted on the front side of the mounting cylinder, the mounting cylinder being provided with mounting grooves running through the left and right sides, the filter plate being clamped in the mounting groove, and a filter groove communicating with the mounting cylinder and the inner groove of the connecting cylinder being provided on the filter plate. The present invention can replace the filter screen when the filter screen is clogged through a screen changing assembly, and can automatically trigger an automatic sealing assembly during the replacement process, thereby greatly enhancing the sealing between the mounting groove and the filter plate, thereby preventing the molten plastic from flowing out, and thus ensuring good safety.

Description

Technical Field

[0001] The invention relates to the technical field of winding devices, and in particular to a plastic film blowing machine with a replaceable net and a use method thereof. Background Art

[0002] Films are widely used in various industries. Film blowing machines are equipment used to produce plastic films, especially thermoplastic resins such as polyethylene (PE) and polypropylene (PP). It uses a special blow molding process to heat and melt plastic particles, blow them into tubular films through a mold, and finally cool and roll them into rolls. When the film blowing machine is used, dry polyethylene particles are added to the lower hopper, and the particles enter the screw from the hopper by their own weight. When the particles come into contact with the bevel of the thread, the rotating bevel surface produces a thrust perpendicular to the bevel surface on the plastic, pushing the plastic particles forward. During the pushing process, the plastic gradually melts due to the friction between the plastic and the screw, the plastic and the barrel, and the collision and friction between the particles, and also due to the external heating of the barrel. The molten plastic is filtered through the head to remove impurities and comes out from the die head. It is cooled by the air ring, blown up, and passed through the herringbone plate, traction roller, and coiled to roll the finished film into a tube.

[0003] The patent document with publication number CN118305923B discloses a plastic sheet film blowing machine with a replaceable screen, comprising a fixed frame, a melting box, a screw conveyor, a filter box and a film extruder, wherein the melting box is fixedly mounted on the upper end of the fixed frame, the screw conveyor is fixedly mounted on the unloading end of the melting box, the filter box is fixedly mounted on the side of the fixed frame, and the film extruder is connected to the lower end of the filter box.

[0004] The film blowing machine in the above technical solution has some problems when replacing the filter screen. The machine needs to be stopped for operation when changing the screen, which will lead to reduced production efficiency. In addition, the high-temperature plastic material in flow is easily brought out when the filter is pulled out, which poses a certain risk. Summary of the invention

[0005] The object of the present invention is to provide a plastic film blowing machine with a replaceable screen and a method of using the same, which solves the problem that the machine needs to be shut down for screen changing, thereby reducing production efficiency, and that high-temperature plastic materials that are flowing are easily brought out when filtering and pulling out, thus posing a certain risk.

[0006] The present invention solves the above technical problems through the following technical solutions, which include:

[0007] A feeding structure, which is used to transport raw materials to the rear;

[0008] A filter structure, which is used to filter particles in the molten plastic material conveyed in the feeding structure, the filter structure is connected to the feeding structure, the filter structure comprises a mounting cylinder, a connecting cylinder, a filter plate and a filter screen, the connecting cylinder is mounted on the front side of the mounting cylinder, the mounting cylinder is provided with mounting grooves on the left and right sides, the filter plate is clamped in the mounting groove, a filter groove connected with the mounting cylinder and the inner groove of the connecting cylinder is provided on the filter plate, a clamping groove is provided on the outer wall of the front side of the filter groove, the filter screen is clamped in the clamping groove, and a replacement groove is also provided on the filter plate;

[0009] A screen changing assembly, which is used to control the movement of the filter plate when replacing the filter screen, the screen changing assembly includes a mounting plate, a hydraulic cylinder and two mounting rods, the mounting cylinder is provided with grooves at the upper and lower parts, the mounting plate is arranged on one side of the mounting cylinder and the mounting plate is fixedly connected to the grooves through the mounting rods, the hydraulic cylinder is installed on one side of the mounting plate and the output end of the hydraulic cylinder is connected to the filter plate;

[0010] The cam is an airtight container, and the cam is used to seal the container until it is fully closed and the filter screen is closed, the cam being used to seal the container until it is fully closed.

[0011] The molding structure is used to control the molding of the plastic film.

[0012] Preferably, the linkage control mechanism further comprises two sealing cylinders, the two sealing cylinders are respectively mounted on the outsides of the through grooves, and the two push rods are respectively clamped in the two sealing cylinders.

[0013] Preferably, a positioning assembly for fixing the filter screen is provided in the filter plate, and the positioning assembly includes an installation iron sheet, a positioning pin, a limit spring and an electromagnet. A receiving groove is provided on the outer wall of the filter plate above the clamping groove, a through hole is provided between the receiving groove and the clamping groove, a key hole corresponding to the through hole is provided on the top of the filter screen, the installation iron sheet is installed on the inner wall of the receiving groove through the installation spring, the positioning pin is installed on the bottom of the installation iron sheet and the positioning pin passes through the through hole and is clamped in the key hole, and the electromagnet is installed on the inner wall of the receiving groove.

[0014] Preferably, a protective cover is installed on the outside of the accommodating groove.

[0015] Preferably, positioning holes are provided at the upper and lower parts of the rear side of the filter screen, and two positioning blocks are installed on the inner wall of the clamping groove, and the positioning blocks are clamped in the positioning holes.

[0016] Preferably, a spring is installed on the front side of the positioning block in the upper part.

[0017] Preferably, a sealing rubber ring is installed on the rear side of the connecting tube, and the sealing rubber ring is clamped in the inner ring groove.

[0018] Preferably, the feeding structure includes a material hopper, a feed pipe, a feed dragon, a motor and a ring heater, the tail end of the feed pipe is installed in a connecting tube, the motor is installed at the front end of the feed pipe, the feed dragon is arranged in the feed pipe and installed at the output end of the motor, the material hopper is arranged above the feed pipe and connected to the feed pipe through a connecting pipe, and the ring heater is installed on the outside of the feed pipe.

[0019] Preferably, the molding structure includes a base frame, an upper frame, a hot melt extruder and a traction assembly, the upper frame is installed above the base frame, the hot melt extruder is arranged in the base frame and the feed end is connected to the rear side of the mounting cylinder, an air ring is installed above the hot melt extruder, and the traction assembly includes a human-shaped frame, a traction frame, a traction roller and a brake motor, the human-shaped frame is located above the base frame and installed at the bottom of the upper frame, the traction frame is installed above the upper frame, the brake motor is installed on the outside of the traction frame, and the traction roller is rotatably installed in the traction frame and installed at the output end of the brake motor.

[0020] A method for using a plastic film blowing machine with a replaceable screen comprises the following steps:

[0021] S1. Raw material preparation and processing: Select qualified plastic materials and put them into the feeding structure, and the feeding structure can process the plastic materials into a molten state;

[0022] S2. Feeding and filtering: The raw materials in the molten state need to pass through the filtering structure before entering the molding structure. The filtering structure can filter the raw materials in the molten state, and the materials in the completely molten state can pass through, and the particulate impurities can be blocked and filtered;

[0023] S3, molding: The molding structure can process the material in the molten state into a plastic film state, thereby completing the preparation of the plastic film.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The present invention can replace the filter screen when it is blocked through the screen changing component. During the replacement process, the automatic sealing component can be automatically triggered, so that the sealing between the installation groove and the filter plate can be greatly enhanced, thereby preventing the molten plastic from flowing out, thereby ensuring good safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A perspective view of the present invention;

[0027] Figure 2 A three-dimensional diagram of the filtering structure of the present invention (when in use);

[0028] Figure 3 A three-dimensional diagram of the filtering structure of the present invention (when the filter screen is replaced);

[0029] Figure 4 It is an exploded view of the filtering structure of the present invention;

[0030] Figure 5 This is a front exploded view of the connecting tube of the present invention;

[0031] Figure 6 It is a rear exploded view of the connecting tube of the present invention;

[0032] Figure 7 An exploded view of the filter plate of the present invention;

[0033] Figure 8 It is a rear view of the filter screen of the present invention;

[0034] Fig. 9 It is a three-dimensional diagram of the feeding structure of the present invention;

[0035] Fig.10 It is a three-dimensional diagram of the molding structure of the present invention.

[0036] The numbers in the figure represent:

[0037] 1. Feeding structure; 101. Material hopper; 102. Feeding pipe; 103. Feeding dragon; 104. Motor; 105. Ring heater; 2. Filtering structure; 201. Mounting cylinder; 202. Connecting cylinder; 203. Filter plate; 204. Filter screen; 3. Screen changing assembly; 301. Mounting plate; 302. Hydraulic cylinder; 303. Mounting rod; 4. Automatic sealing assembly; 5. Sealing mechanism; 501. Sealing ring; 502. Semi-ring sealing plate; 503. Mounting spring; 6. Linkage control mechanism; 601. Fixed plate; 602. Push rod; 7. Molding structure; 701. Bottom Frame; 702, upper frame; 703, hot melt extruder; 704, traction assembly; 7041, humanoid frame; 7042, traction frame; 7043, traction roller; 7044, brake motor; 8, positioning assembly; 801, installation iron sheet; 802, positioning pin; 803, limit spring; 804, electromagnet; 9, card release groove; 10, inner ring groove; 11, semicircular groove; 12, accommodation groove; 13, key hole; 14, protective cover; 15, positioning hole; 16, positioning block; 17, elastic spring; 18, sealing rubber ring; 19, air ring; 20, replacement groove; 21, installation groove. DETAILED DESCRIPTION

[0038] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0039] This embodiment provides a technical solution: a plastic film blowing machine with a replaceable screen, such as Figure 1-Figure 10 As shown, it includes a feeding structure 1, a filtering structure 2, a screen changing component 3, an automatic sealing component 4 and a molding structure 7.

[0040] In the specific implementation, such as Figure 1 and Fig. 9 As shown, the feeding structure 1 is used to transport raw materials to the rear, and the feeding structure 1 includes a material hopper 101, a feeding pipe 102, a feeding dragon 103, a motor 104 and a ring heater 105. The tail end of the feeding pipe 102 is connected to the filtering structure 2, the motor 104 is installed at the front end of the feeding pipe 102, the feeding dragon 103 is arranged in the feeding pipe 102 and is installed at the output end of the motor 104, and the raw materials can be transported to the filtering structure 2 through the feeding dragon 103. The material hopper 101 is arranged above the feeding pipe 102 and is connected to the feeding pipe 102 through a connecting pipe. The raw materials can be continuously put into the feeding dragon 103 through the material hopper 101, and the ring heater 105 is installed on the outside of the feeding pipe 102. The inside of the feeding pipe 102 can be heated by the ring heater 105, so that the plastic material can be processed into a molten state.

[0041] In the specific implementation, such as Figure 2 and Figure 3As shown, the filtering structure 2 is used to filter particles in the plastic material in a molten state transported in the feeding structure 1. The filtering structure 2 is connected to the feeding structure 1. The filtering structure 2 includes a mounting cylinder 201, a connecting cylinder 202, a filter plate 203 and a filter screen 204. The tail end of the feeding pipe 102 is installed in the connecting cylinder 202. The plastic processed into a molten state in the feeding pipe 102 can enter the connecting cylinder 202 and then enter the mounting cylinder 201. The connecting cylinder 202 is installed on the front side of the mounting cylinder 201. The mounting cylinder 201 is penetrated by a mounting groove 21 on the left and right sides. The filter plate 203 is clamped in the mounting groove 21. The filter plate 203 is provided with a filter that is connected to the mounting cylinder 201. The filter tank is connected to the inner tank of the connecting cylinder 202, and a card slot 9 is provided on the outer wall of the front side of the filter tank. The filter screen 204 is carded in the card slot 9. The molten plastic material passing through can be filtered through the filter plate 203 and the filter screen 204 above it, and the completely molten plastic can pass through, and the particulate impurities can be blocked and filtered. The filter plate 203 is also provided with a replacement slot 20. Through the replacement slot 20, a new filter screen 204 can be first installed in the replacement slot 20 when changing the screen. Therefore, it can be ensured that the filter screen 204 in the replacement slot 20 can replace the filter screen 204 on the left to complete the filtering process in a short time when changing the screen, thereby realizing non-stop screen changing.

[0042] The filter screen 204 can be replaced by the filter screen 204 when the filter screen 204 is replaced. At this time, the filter screen 204 can be replaced, and the replacement slot 20 can be moved to a position aligned with the inner diameter of the installation cylinder 201. After the replacement is completed, the filter plate 203 can be pulled back to the installation cylinder 201 by the hydraulic cylinder 302 to continue the filtering operation.

[0043] In the specific implementation, such as Figure 4-Figure 6As shown, the automatic sealing component 4 is used to automatically increase the sealing between the inner wall of the installation groove 21 and the filter plate 203 when the filter screen 204 is replaced. The automatic sealing component 4 includes a sealing mechanism 5 and a linkage control mechanism 6 for controlling the movement of the sealing component. The sealing mechanism 5 includes a sealing ring 501, two semi-ring sealing plates 502 and two mounting springs 503. An inner ring groove 10 is provided on the front side of the mounting cylinder 201. Two semi-circular grooves 11 that are mirror-imaged up and down are provided between the inner ring groove 10 and the inner wall of the installation groove 21. The sealing ring 501 is installed on the inner wall of the inner ring groove 10 through the mounting springs 503. The mounting springs 503 can ensure that the sealing ring 501 is stably arranged and can move with changes in pressure. The two semi-ring sealing plates 502 are installed on the rear side of the sealing ring 501 and are respectively clamped in the two semi-circular grooves 11. The semi-ring sealing plates 502 are clamped in the semi-circular grooves 11 and the ends can be aligned with the filter plate 203 contact, thereby can greatly improve the sealing effect, the linkage control mechanism 6 includes a fixed plate 601 and two push rods 602, two through grooves are set between the inner wall of the inner ring groove 10 and the outer wall of the mounting tube 201, the through groove is located between the sealing ring 501 and the connecting tube 202, the fixed plate 601 is installed on the front side of the end of the filter plate 203, the two push rods 602 are installed on one side of the filter plate 203 and are respectively clamped in the two through grooves, through the linkage control mechanism 6, the push rod 602 can be moved into the through groove while the filter plate 203 moves, so that the inside of the inner ring groove 10 can be pressurized, so that the sealing ring 501 can be squeezed inwardly, so that the plate half-ring sealing plate 502 and the filter plate 203 can be tightly fitted, especially when the filter groove and the inner groove of the mounting tube 201 are just offset, the hydraulic pressure in the connecting tube 202 will be significantly enhanced, so that leakage can be prevented to the greatest extent.

[0044] When changing the screen, first install the short-term filter screen 204 in the replacement groove 20, and then push the filter plate 203 to move by the hydraulic cylinder 302. When the filter plate 203 moves, it can drive the fixed plate 601 and the push rod 602 to move, and the push rod 602 can move into the sealing cylinder and the through groove. Therefore, the push rod 602 can compress the air in the inner ring groove 10, thereby increasing the internal pressure of the inner ring groove 10. Under the action of the air pressure, the sealing sheet can be pushed and the installation spring 503 can be squeezed, so that the semi-ring sealing plate 502 can be squeezed inward, so that the semi-ring sealing plate 502 and the filter plate 203 can be more closely attached, thereby preventing the plastic material from flowing out. When the position of the filter screen 204 on the filter plate 203 moves to the outside of the installation cylinder 201, the state at this time is as follows Figure 3 As shown, the filter screen 204 can be replaced, and the replacement slot 20 can be moved to a position aligned with the inner slot of the installation cylinder 201, so the screen replacement operation can be carried out without stopping the machine. After the replacement is completed, the filter plate 203 can be controlled to reset again.

[0045] Furthermore, the linkage control mechanism 6 also includes two sealing cylinders, which are respectively installed on the outside of the through groove, and the two push rods 602 are respectively clamped in the two sealing cylinders. The sealing cylinders can increase the sealing between the push rods 602 and the inner ring groove 10, thereby ensuring accurate air pressure changes.

[0046] In the specific implementation, such as Figure 7 and Figure 8 As shown, a positioning assembly 8 for fixing the filter screen 204 is provided in the filter plate 203, and the positioning assembly 8 includes an installation iron sheet 801, a positioning pin 802, a limit spring 803 and an electromagnet 804. A receiving groove 12 is provided on the outer wall of the filter plate 203 located above the card slot 9, a through hole is provided between the receiving groove 12 and the card slot 9, and a key hole 13 corresponding to the through hole is provided on the top of the filter screen 204. The installation iron sheet 801 is installed on the inner wall of the receiving groove 12 through the installation spring 503, the positioning pin 802 is installed on the bottom of the installation iron sheet 801 and the positioning pin 802 passes through the through hole and is fixed in the key hole 13, and the electromagnet 804 is installed on the inner wall of the receiving groove 12. The positioning component 8 can ensure that the filter 204 is set stably, and the filter 204 can be easily disassembled when changing the filter. Since the end of the positioning pin 802 is clamped with the key hole 13 at the top of the filter 204, the stability of the filter 204 can be ensured. When the filter 204 needs to be replaced, the electromagnet 804 is connected to an external power supply. The electromagnetic block can generate magnetism and attract the installation iron sheet 801. The installation iron sheet 801 can squeeze the limit spring 803 and move toward the electromagnetic block. At the same time, the positioning pin 802 can be moved out of the key hole 13. When the positioning pin 802 is completely moved out of the key hole 13, the filter 204 can be directly moved out of the card slot 9, and then the filter 204 can be replaced.

[0047] Furthermore, a protective cover 14 is installed on the outside of the receiving groove 12 , and the protective cover 14 can protect the positioning assembly 8 inside the receiving groove 12 .

[0048] Furthermore, positioning holes 15 are provided on the upper and lower parts of the rear side of the filter 204, and two positioning blocks 16 are installed on the inner wall of the card slot 9. The positioning blocks 16 are clamped in the positioning holes 15. The positioning blocks 16 cooperate with the positioning holes 15 to facilitate the installation of the filter 204.

[0049] Furthermore, a spring 17 is installed on the front side of the upper positioning block 16, which can make it easier to disassemble the filter 204. When the positioning pin 802 is moved out of the key hole 13, the filter 204 can be pushed outward under the elastic force of the spring 17, so the disassembly can be completed automatically.

[0050] Furthermore, a sealing rubber ring 18 is installed at the rear side of the connecting tube 202 . The sealing rubber ring 18 is clamped in the inner ring groove 10 . The sealing rubber ring 18 can ensure good sealing between the connecting tube 202 and the installation tube 201 .

[0051] In the specific implementation, such as Figure 1 and Fig.10 As shown, the molding structure 7 is used to control the molding of the plastic film. The molding structure 7 includes a bottom frame 701, an upper frame 702, a hot melt extruder 703 and a traction assembly 704. The upper frame 702 is installed above the bottom frame 701. The hot melt extruder 703 is arranged in the bottom frame 701 and the feed end is connected to the rear side of the mounting cylinder 201. An air ring 19 is installed above the hot melt extruder 703. The traction assembly 704 includes a human-shaped frame 7041, a traction frame 7042, a traction roller 7043 and a brake motor 7044. The human-shaped frame 7041 is located on the bottom frame 701. The traction frame 7042 is installed on the top of the upper frame 702, the brake motor 7044 is installed on the outside of the traction frame 7042, the traction roller 7043 is rotatably installed in the traction frame 7042 and installed on the output end of the brake motor 7044. The plastic material filtered by the filtering structure 2 can enter the hot melt extruder 703 to be extruded into a film and discharged. The plastic film can be cooled and formed by the air ring 19, and can continuously move upward under the traction action of the traction component 704 to continue to blow film forming.

[0052] When this embodiment is in use, raw materials can be continuously fed into the feeding dragon 103 through the material hopper 101, and the annular heater 105 is installed on the outside of the feeding pipe 102. The inside of the feeding pipe 102 can be heated by the annular heater 105, so that the plastic material can be processed into a molten state and enter the connecting cylinder 202 and the installation cylinder 201. The molten plastic material passing through can be filtered by the filter plate 203 and the filter screen 204 above it, and the completely molten plastic can pass through, and the particulate impurities can be blocked and filtered. The plastic material filtered by the filter structure 2 can enter the hot melt extruder 703, be extruded into a film and discharged, and the plastic film can be cooled and formed by the air ring 19, and can continuously move upward under the traction of the traction component 704 to continue the blown film molding.

[0053] After working for a period of time, there are many particulate impurities and the filter screen 204 needs to be replaced. When replacing, first install the filter screen 204 for short-term use in the replacement groove 20, and then push the filter plate 203 to move through the hydraulic cylinder 302. When the filter plate 203 moves, it can drive the fixed plate 601 and the push rod 602 to move, and the push rod 602 can move into the sealing cylinder and the through groove. Therefore, the push rod 602 can compress the air in the inner ring groove 10, thereby increasing the internal pressure of the inner ring groove 10. Under the action of air pressure, the sealing sheet can be pushed and the installation spring 503 can be squeezed, so that the semi-ring sealing plate 502 can be squeezed inward, so that the semi-ring sealing plate 502 and the filter plate 203 can be more closely attached, thereby preventing the plastic material from flowing out. When the position of the filter screen 204 on the filter plate 203 moves to the outside of the installation cylinder 201, the state at this time is as follows Figure 3 As shown, the filter screen 204 can be replaced, and the replacement slot 20 can be moved to a position aligned with the inner slot of the installation cylinder 201, so the screen replacement operation can be carried out without stopping the machine. After the replacement is completed, the filter plate 203 can be controlled to reset again.

[0054] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims, but all of them will fall within the scope of protection of the present invention.

Claims

1. A plastic film blowing machine with replaceable screen, characterized in that: include: A feeding structure (1), which is used to transport raw materials to the rear; A filter structure (2) for filtering particles in the plastic material in a molten state conveyed in the feeding structure (1); the filter structure (2) is connected to the feeding structure (1); the filter structure (2) comprises a mounting cylinder (201), a connecting cylinder (202), a filter plate (203) and a filter screen (204); the connecting cylinder (202) is mounted on the front side of the mounting cylinder (201); a mounting groove (21) is provided through the left and right sides of the mounting cylinder (201); the filter plate (203) is clamped in the mounting groove (21); a filter groove is provided on the filter plate (203) and is connected to the inner grooves of the mounting cylinder (201) and the connecting cylinder (202); a clamping groove (9) is provided on the outer wall of the front side of the filter groove; the filter screen (204) is clamped in the clamping groove (9); and a replacement groove (20) is also provided on the filter plate (203); A screen changing assembly (3) for controlling the movement of a filter plate (203) when replacing a filter screen (204), the screen changing assembly (3) comprising a mounting plate (301), a hydraulic cylinder (302) and two mounting rods (303); the mounting cylinder (201) is provided with grooves at the upper and lower parts; the mounting plate (301) is arranged on one side of the mounting cylinder (201) and the mounting plate (301) is fixedly connected to the grooves via the mounting rods (303); the hydraulic cylinder (302) is mounted on one side of the mounting plate (301) and the output end of the hydraulic cylinder (302) is connected to the filter plate (203); An automatic sealing assembly (4) is used to automatically increase the sealing performance between the inner wall of the installation groove (21) and the filter plate (203) when replacing the filter screen (204). The automatic sealing assembly (4) comprises a sealing mechanism (5) and a linkage control mechanism (6) for controlling the movement of the sealing member. The sealing mechanism (5) comprises a sealing ring (501), two semi-circular sealing plates (502) and two installation springs (503). An inner ring groove (10) is provided on the front side of the installation cylinder (201). Two semi-circular grooves (11) arranged in an upper and lower mirror image are provided between the inner ring groove (10) and the inner wall of the installation groove (21). The sealing ring (501) is installed by The spring (503) is mounted on the inner wall of the inner ring groove (10); the two semi-circular sealing plates (502) are mounted on the rear side of the sealing ring (501) and are respectively clamped in the two semi-circular grooves (11); the linkage control mechanism (6) comprises a fixing plate (601) and two push rods (602); two through grooves are provided between the inner wall of the inner ring groove (10) and the outer wall of the mounting tube (201); the through grooves are located between the sealing ring (501) and the connecting tube (202); the fixing plate (601) is mounted on the front side of the end of the filter plate (203); the two push rods (602) are mounted on one side of the filter plate (203) and are respectively clamped in the two through grooves; The molding structure (7) is used to control the molding of the plastic film.

2. A plastic film blowing machine with a replaceable screen as claimed in claim 1, characterized in that: The linkage control mechanism (6) further comprises two sealing cylinders, the two sealing cylinders are respectively mounted on the outside of the through groove, and the two push rods (602) are respectively clamped in the two sealing cylinders.

3. A plastic film blowing machine with a replaceable screen as claimed in claim 1, characterized in that: A positioning assembly (8) for fixing the filter screen (204) is arranged inside the filter plate (203), the positioning assembly (8) comprising an installation iron sheet (801), a positioning pin (802), a limit spring (803) and an electromagnet (804); a receiving groove (12) is provided on the outer wall of the filter plate (203) located above the clamping groove (9); a through hole is provided between the receiving groove (12) and the clamping groove (9); a key hole (13) corresponding to the through hole is provided on the top of the filter screen (204); the installation iron sheet (801) is installed on the inner wall of the receiving groove (12) via the installation spring (503); the positioning pin (802) is installed on the bottom of the installation iron sheet (801) and the positioning pin (802) passes through the through hole and is clamped in the key hole (13); and the electromagnet (804) is installed on the inner wall of the receiving groove (12).

4. A plastic film blowing machine with a replaceable screen as claimed in claim 3, characterized in that: A protective cover (14) is installed outside the accommodating groove (12).

5. A plastic film blowing machine with a replaceable screen as claimed in claim 4, characterized in that: The filter screen (204) has a positioning hole (15) formed on the upper and lower parts of its rear side. Two positioning blocks (16) are mounted on the inner wall of the clamping groove (9), and the positioning blocks (16) are clamped in the positioning hole (15).

6. A plastic film blowing machine with a replaceable screen as claimed in claim 5, characterized in that: A spring (17) is installed on the front side of the positioning block (16) in the upper part.

7. A plastic film blowing machine with a replaceable screen as claimed in claim 1, characterized in that: A sealing rubber ring (18) is installed on the rear side of the connecting tube (202), and the sealing rubber ring (18) is clamped in the inner ring groove (10).

8. A plastic film blowing machine with a replaceable screen as claimed in claim 1, characterized in that: The feeding structure (1) comprises a material hopper (101), a material delivery pipe (102), a material delivery dragon (103), a motor (104) and a ring heater (105); the rear end of the material delivery pipe (102) is installed in a connecting tube (202); the motor (104) is installed at the front end of the material delivery pipe (102); the material delivery dragon (103) is arranged in the material delivery pipe (102) and installed at the output end of the motor (104); the material hopper (101) is arranged above the material delivery pipe (102) and connected to the material delivery pipe (102) via a connecting pipe; and the ring heater (105) is installed outside the material delivery pipe (102).

9. A plastic film blowing machine with a replaceable screen as claimed in claim 1, characterized in that: The molding structure (7) comprises a bottom frame (701), an upper frame (702), a hot melt extruder (703) and a traction assembly (704), wherein the upper frame (702) is installed above the bottom frame (701), the hot melt extruder (703) is arranged inside the bottom frame (701) and the feed end is connected to the rear side of the mounting cylinder (201), an air ring (19) is installed above the hot melt extruder (703), and the traction assembly (704) comprises a humanoid frame (7041), a traction assembly (7042), and a traction assembly (7044). The invention relates to a human-shaped frame (7041) and a bottom frame (701), a traction roller (7043) and a brake motor (7044), wherein the human-shaped frame (7041) is located above the bottom frame (701) and is installed at the bottom of the upper frame (702), the traction frame (7042) is installed above the upper frame (702), the brake motor (7044) is installed outside the traction frame (7042), and the traction roller (7043) is rotatably installed in the traction frame (7042) and is installed at the output end of the brake motor (7044).

10. A method for using a plastic film blowing machine with a replaceable screen, characterized in that: The method of use is applied to the plastic film blowing machine according to any one of claims 1 to 9, comprising the following steps: S1. Raw material preparation and processing: Select qualified plastic materials and put them into the feeding structure (1). The feeding structure (1) can process the plastic materials into a molten state; S2, feeding and filtering: the raw material in a molten state needs to pass through the filtering structure (2) before entering the molding structure (7). The filtering structure (2) can filter the raw material in a molten state, so that the material in a completely molten state can pass through, and the particulate impurities can be blocked and filtered; S3, molding: The material in a molten state can be processed into a plastic film state through the molding structure (7), thereby completing the preparation of the plastic film.

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